package cn.xf;

import java.util.HashMap;
import java.util.Hashtable;

public class TestHash {
    public static void main(String[] args) {
        HashMap map = new HashMap();
        map.put("null","null");
        Object oj = map.get("null");
        System.out.println(oj);
        /*Hashtable table = new Hashtable();
        table.put("null","null");
        Object ta = table.get("null");
        System.out.println(ta);*/
    }
}
